Process for the preparation of amino-dianthrimides



Patented Feb. 1, 1927.

UNITED STATES PATENT arr.

HUGH MILLS BUNIBURY, F MANCHESTER, ENGLAND, ASSIGIIOR TO BRITISH STUFIFS CORPORATION LIMITED, OF MANCHESTER, ENGLAND.

PROOES$ FOR THE PREPARATION OLE AMINO-DIANTHBIMIDES.

No Drawing. Application filed. October 17, 1925, Serial No. 63,004, and in Great Britain December 19.

I have found that the anthraquinonemono-oxamic acids of the type nrnnonnooooon,

and their salts, (where AQ represents a divalent anthraquinone residue) are useful intermediates in the preparation of mono-, di, etc., aminoanthrimides.

The mono-oxamic acids are readily obtained in excellent yield direct from the diaminoanthraquinones and oxalic acid by methods such as that of the subjoined.

NHL!

The mono-oxamic acids-of 1:4- and 1:8-diamino-anthraquinones, diaminoanthrarufin, diaminochrysazin, etc., may be prepared in a similar manner. In this way one and one only of the two amino groups present is Example 1.

parts of 1:.5-diamino-anthraquinone,

i0 parts'of crystallized oxalic acid and parts of water are stirred into a stiff paste and maintained at a temperature of about 105-110 G. for 2% hours, with occasional stirring. Small quantities of water may be added from time to time to compensate for losses by evaporation and keep the amount constant. The product is extracted with hot Water. A yield of about 9095 per cent is obtained. The reactions may be formulated as follows,

' NH.OO.COOH.

be prepared by heating the oxamic acids to a suitably high temperature. of the resulting dianthrimide removes the oxalyl (or formyl) group and other acyl groups which maybe present, such as,for example, acetyl, or benzoyl, thus yielding the corresponding amino dianthrimide.

Example 2. a 4 5-diamino-1:1"-dianthrimide Y may be prepared in the following way:

11.4 parts of 4E benzoylamin0-Lchloroan- Hydrolysis tit thraquinone, 10 parts of 1:5-diamino-an- V thraquinone mono-oxamic acid (which may be prepared as described), 3 parts of fused sodium acetate, 0.3 part of copper powder and. parts of nitrobenaene are heated for 15 hours at a gentle boil. The product is filtered oil at 70-80 C. and Well Washed with alcohol.

nnooouifi nrroocoon. o0 c0\/\ Cf I 1 oo oo NH.CO.C5H5 NH: co 00 -s q 4 t co V 00 NH 7 NH Oico o0 co D 00 I nnooooon NH:

The liydroly sis is carried out by heating the product in twenty times its Weight of 70 per cent sulphuric acid at 100 C. for 2 3 hours. i

7 Example 3.

5 5-diamin0-1 1-dianthrimide may be Naoooine The amino dianthriniides so obtained are Valuable intermediates for vat dyestufis.

The Inethod of making anthraquinone inono-oxarnic acids described, I do not herein claim, it forming the matter of another applicat-ion, Serial No. 103,985, filedApril22,1925.

I claim I 1.1m the ln'anufacture 0f amino-diali- NH.O0.000H.

thriniides, the process which comprises condensation of an anthraquinone-mono-oXan1ic acid of the type j NH AQNHCQCOOH, wherein AQ, represents a divalent anthraprepared from 5-benzoyla1nino-l-chloroanthraquinone and 1: 5-diaminoanthraquinone oxaniic acid in a manner similar to that described in Example 1".

NH.O0.000H

NH l 0 K) quinone residue, with halogenated a nthraquinones and hydrolysis of the acyla-in'ino derivative so obtained.

2 The method of making lzzo' dianiino- 1Z1Cll ;1'11tl1Il111ll which comprises condensing ekbenzoylainino-1-chloroanthraquinone with 1 5-dianiino=anthraquinone nio'noo xainic acid and hydrolyz'ing the acylamino derivative so obtained.

In testimony whereof I have hereunto afiixed my signature.

HUGH MILLS BUNBURY. 

